#!/bin/sh

if [ $# -lt 2 ]; then
    cat - <<EOF
$0 FROM-DIR TO-DIR ENVIRONMENT

Copies files from one directory to another with possible
transformations.

Files named FILE.spp will be transformed via the spp preprocessor
subject to environment definitions.  Source FILE.copyimgspp results in
destination file FILE in the corresponding destination directory.

Files named FILE.copyimgsh are run as shell scripts in (i.e. via chdir)
the corresponding destination directory (and not copied).

First regular files are copied.  Then transformations are preformed.
Finally, shell scripts are run.
EOF
  exit 1;
fi

FROM_DIR=$1
TO_DIR=$2

FILTER=" -and -not -name '*~'";
FILTER="${FILTER} -and -not -name '.*~'";
FILTER="$FILTER -and -not -path '*/.git*'";
FILTER="$FILTER -and -not -path '*/.svn*'";
FILTER="$FILTER -and -not -path '*/.CVS*'";

FROM_FILES=`(cd $FROM_DIR; eval "find . -not -type d $FILTER")`;
 FROM_DIRS=`(cd $FROM_DIR; eval "find .      -type d $FILTER")`;

COPY_FILES=
SPP_FILES=
SH_FILES=
for f in $FROM_FILES; do
  case $f in
    *.copyimgspp) SPP_FILES="$SPP_FILES $f" ;;
    *.copyimgsh)   SH_FILES="$SH_FILES $f" ;;
    *)		 COPY_FILES="$COPY_FILES $f";;
  esac
done

# Make destination directories.
mkdir -p $TO_DIR;
if [ "$FROM_DIRS" != "" ]; then
  for d in $FROM_DIRS; do
    mkdir -p $TO_DIR/$d;
  done
fi

# Copy files
if [ "$COPY_FILES" != "" ]; then
    tar -cf - -C $FROM_DIR $COPY_FILES | tar --preserve-permissions -xf - -C $TO_DIR;
fi

# Use spp to transform any spp files
if [ "$SPP_FILES" != "" ]; then
  for f in $SPP_FILES; do
    d=`dirname $f`;
    b=`basename $f .copyimgspp`;
    mkdir -p $TO_DIR/$d;
    t=$TO_DIR/$d/$b;
    spp -o $TO_DIR/$d/$b $FROM_DIR/$f || exit 1;
  done;
fi

# Now that all files have been copied/created we run any shell scripts
ABS_FROM_DIR=`(cd $FROM_DIR; pwd)`;
if [ "$SH_FILES" != "" ]; then
  # Allow directory to define some functions
  if [ -f $FROM_DIR/copyimgsh-functions.sh ]; then
    . $FROM_DIR/copyimgsh-functions.sh ;
  fi ;
  for f in $SH_FILES; do
    d=`dirname $f`;
    b=`basename $f`;
    mkdir -p $TO_DIR/$d;
    (cd $TO_DIR/$d; . $ABS_FROM_DIR/$d/$b) || exit 1;
  done;
fi;
